I finally got around to getting Calibre - after I saw that it could convert TO ePub and not just from ePub to other formats. I got some weird/wonky errors (espec. when using HTML as my input) but it looks like I was able to get it to convert to ePub when I used my mobi files as the input/source files. I used Adobe Digital Editions to view the ePub formatted files after Stanza seemed to show "junk" in the read window. Anyway... I converted all my chapters-released-to-date of my SHIMMER eSerial to ePub and added those download links to the grid on my SHIMMER page, which is here:
http://www.passarella.com/shimmer.htm
(Chapters 1 through 6 are now available.)
Thanks for pointing me in the right direction!
-John "Jack" Passarella